We opted for a set of 245/75R16 Goodyear Wrangler DuraTrac tires that we ordered from Discount Tire Direct. These tires are slightly larger than stock and provide better traction and tougher sidewalls than the mud and snow street tires that came off of our Grand Cherokee. The new tires fit on the factory aluminum Grand wheels. Larger aftermarket tires with more aggressive tread not only make a Jeep like ours look a lot better, they also greatly improve off-road performance and bring added peace of mind in harsh areas like the deserts of the Southwest.